Dog’s life

Dear Economist,

I’ve been dating someone for a few months and the relationship is now quite serious. There’s just one problem: his dog. I’ve no strong feelings about dogs, but he’s had this mutt for years and seems to love it more than he loves me. I could swallow my reservations and see where the relationship goes, or I could opt for the old “either the dog goes or I do” ultimatum. What should I do?